Patent GB-571193-A (GB)
Title: Improvements in hot water or steam boilers for central heating systems and the like
IPC: F24H1/44
Filed: 1943-12-07
Abstract: 571,193. Steam and hot-water boilers. DANKS OF NETHERTON, Ltd., and DALGLEISH, N. Dec. 7, 1943, No. 20441. [Classes 64 (i) and 123 (ii)] In a steam or hot-water boiler, for a highpressure central heating system, in which fuel from the hopper or magazine is fed to the boiler furnace by gravity, the main walls of the hopper are constituted or defined by water-cooled surfaces forming part of the boiler and the return tubes of the heating system, so that the fuel is maintained at a temperature below that at which burning back can occur. In the hotwater boiler shown, comprising water drums 3, 4, 10 connected by tubes 2, 11, 12, with the drum 3 provided with a hot-water take-off connection 5, the hopper is defined on one side by the tubes 2 and on the other side by tubes 6 which extend from the heating system return water header 7 to a header 8, the latter being connected to the drum 10 by an external rising water connection 9. The lower ends of the tubes 6 support the necessary fire-bars 14, and the spaces between adjacent tubes 12 at the front of the boiler are blanked off by firebricks 13 so that the products of combustion are compelled to travel to the rear of the boiler before passing into the space bounded by the several water drums and connecting tubes; from this space they are preferably directed to a smoke box at the boiler front, and from thence through smoke tubes 16 extending longitudinally through the upper drum 3 to a chimney flue at the back of the boiler. The spaces between adjacent tubes in the rows 2, 11 are also blanked off by narrow welded-in plates 20; alternatively the tubes are formed of elliptical sections and assembled in abutting relationship. In a steam-boiler, with the drum 3 serving as a steam and water drum, all the smoke tubes 16 are disposed below the normal water line. Two boilers may be arranged side to side to form a duplex boiler, not shown, the drums 3, 4 and connecting tubes 20 of each of the two single boilers forming the opposite side walls of the hopper, the throat of the latter being located above the open of the V-shaped furnace constituted by the two sets of tubes 6 each set of which is deposited between a lower return water header below the drum 10 and a second header just below the drum 4 and connected to the drum 10 by an external riser. Fuel may be supplied to the hopper through one or more openings, each normally closed by a door 22 having a peripheral gasket 23 seating on a projecting flange 24 of an angle member 25 secured therearound, and preferably the doors are supported through rollers 26 from a horizontal frame 27 which is pivotally mounted on the boiler by links 28 and is provided with screwoperating means 31 to effect upward or downward movement thereof with consequent movement of the doors away from or towards said openings. Primary air is admitted to below the furnace grate from a trunk 38 having outlets controlled by adjustable plate valves, and secondary air, which has been heated by passage through the double side wall 34 of the boiler, above the said grate through openings 41.